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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e6d9667be24513100b8b2975cc9b669ca066cdf4e7d0f55f8f4c730bcb855e' 
  AND token = 'lE4cAgTPrkTB4bTF674ektka+1tSIFn6E9S6tmQa0Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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