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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94779e532a652cf53c8a780c5da8458617cd659114ac61a406f3269d7650daa2' 
  AND token = 'p1pd9VMVyXxY9/nzEvPH2t9jPcJ4MP2+a4nUh7jTZAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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