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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0e9464aa266746f01111729434ce98e3900a09a3a1512e33b3983e61aa0875' 
  AND token = '5y9GSw2ww8hSoF25tjHjU7m/Gm22pbK5UaSQOBs34Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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