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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f78f71259d00e8a64bad0f57322b83635be5368f5a3127820a8b55caa3fd2c' 
  AND token = 'H/K3rtENUMf4O4qPfLsX3rFS5rrm73onX1U7SAmwdns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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