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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f202e67643f6d891da2f8c256d2b59848c0b06d694fd2198b48bcdb0c58f19' 
  AND token = 'ciGr9YIqmMNgI0v5Il0RESRVBDlB6v+w2KbjtUT1d9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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