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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f697f9c7299ca088c7f7eb84b0c546d23ea531f3945757e9c743247c9feb705' 
  AND token = 'jBEIfJMMz2gjcrxEQsGMTv/K50HBuNsSwkY4Qzi2MHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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