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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18376a41a476c040e2a9991058d5eac0988e253e8ae96f14e57f2bb2f2435f1' 
  AND token = 'a3WH09WjX6dVLPPY3Z9qPn/Dj32M749stHiqIfF+ibU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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