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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6732d7274dfe20ccc65e49b6b45f5419a9c9399b2c417de77fc75f0eff18cf' 
  AND token = 'gyNxYnxcxCluafLzG57Sz1z8TAHSeKNlfk00bTO0Qjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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