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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75204fccf447fdbdff4558e4b50d555f5a9d6d99b26d550435d4f8a91c82ac2' 
  AND token = 'Ioe6AnwqFBDaGvMqfaOpVv8RBNBWmdtYtPjzPB5+uV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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