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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c08a5a622f077b37e5a8585a57ff25dff11f6fc5124c7362bffb7014e63617a' 
  AND token = 'uw3ScwbqVmMqTj0xzghRNUXksPuASqx9OCZLmNT0wyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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