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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55f125d3e62e1bcda0824530624b47c85fed0ab2670d2293e02ecc926539985' 
  AND token = 'baeH4Kd6m8IbRuVNmlf3lQEVZbZ6yhyepWbLyWkRFEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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