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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ddebe380758db5da671b3aa4835af30edd702ce6f2b0a5bd48dd6273600a9' 
  AND token = 'LNBhBcICpqQ1AS4VdAG77eRM5yIILmz06TfGuLdm9l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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