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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751a2d42549719d1e6bed6321206798dccb1dcae7966a516c7c31739166ed20f' 
  AND token = '199SWRZQqNdJEJBf2JP5/2FUqw3/VZKfVGJNpwCp5k4=' 
  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"
    }
  }
}