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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7524a387284766893bc2717faa41624dcf7d986dc846bd7d89ca76d8a71517cd' 
  AND token = '+RnSKbG6t+8xJC7eLTOoIeBaJX7caJkXfjH8KkunOMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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