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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5bcc848665913dc8aeae7314b9ccbd2ff589a609ef9007dbc5fd67d12a0872' 
  AND token = '2zjeazmyxyB4jzXlJd/paMS1rz3PdTbYioOWRGCgnA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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