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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfd0008ddb2d9e96047846c85e8372b8c64f196ecdc5d33fa9ca328da7ca6a0' 
  AND token = 'w7UH4rxLdnWmP8Tr1RToeQUkshN45h3M1Iw+8IAzn+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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