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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2518d01d88a6697a08a6f3392e2c5c35dc38eff2809dfe0f950265ef1f6d5e6b' 
  AND token = 'zEnXfHeRLRaVS9Cfr1cH6JkIIrDTxnTxrUPlhSBqZ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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