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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeedf4cd14fbaef197a016379f97b1293a71a67aabb4d04f7f35711db0a61125' 
  AND token = 'NTO+aZEeiKD3XASJyWwzjKIKVMhT9dAiRPD3Blv4K1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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