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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489ec1f919c75d37fd877004982de997f1efcd76792c93e4c0fe79d8f08e8284' 
  AND token = 'DyUCk90aw+FzWcK4Nrhk38P1R3dXjd3Bb1JM1AnuBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}