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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2237476ac6007ae01a8aba9c6d508974205c2682366f8243275f115c42651039' 
  AND token = 'O56/x+TvvA9BhsnPPxKnfQOxAGGMaaAl+0O+igrWiGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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