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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57803f1c555c8f232a3ceb9d749842e8af9b3021004d8804e8ef14c3ae0947cd' 
  AND token = 'tnm2yBC29NOkEaEj4h2CKVbFdBOMppdg+EPkuwQcufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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