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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e067aa5dbbadb42cd81e7eb02df2b26ee93463b7d16edd6156cf2eb5209339a' 
  AND token = 'kyxeCcbSileegYrIrH4nkwUHdjoMNfHuH+O5mz94jK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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