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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b1bc224d82c98db121ad3c23929aabba1e127b1567f3df1aa5dbead037e152' 
  AND token = 'qYd+0X/ws5OBdPXsAuQW5p+bbiEIHEwH9C7IQKH7I5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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