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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67abf9db7acf6f6bd3a2c0e5bad69f8f30d97ab5de3a375415dafe9066f98e7' 
  AND token = 'eaUrJyviSn+w6QtEHBrYfe/fA1R/PupB2kqt6mFYFJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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