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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a547b80da1edd5a1327adc33e340aa5a4bea7bf0378f31f3fcbd41c4f3988e4' 
  AND token = '7IUV3ZT0dgZ0VN3O3ti4ZBn4JO1S3v7Xz9L2SQfQ5Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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