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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1868188372f9650998ecc494978c428786aa26d54ae8df7ff9ef5bfd14d8f90' 
  AND token = 't0S8VMk3lsOrrEjHPGe1a1zGbc2/w1TWFwLQ0xexKy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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