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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95685180506dd824fd4a4c853fe3d80331efb1a24de662908e3930d938dd2eb' 
  AND token = '3AbsLDUCfR6zi0DGL8Eulnls5QfGmwSSHAt7vH3qR4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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