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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbaf1a6b1c4386e3ea8057d13e36a8ffb179e7869a03ffcb68bb2d165aa921f' 
  AND token = 'pgFU5snfwe9w2Da/BLtSOSaY0yNUXT47VVqMX+5+uMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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