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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b8e393518b1f23b996d993abc2a00a2b01d7adea98cc6e9d763b4cd6c49c6c' 
  AND token = 'wooxeplZBpMzmsZoTGZsisZLE95U6SQy6vD+/qd4YzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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