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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eebc0db920e4ea6eb6b5db5ff0105d713a43b224101c319368bd4c4c130cf4' 
  AND token = 'Nz1VTt0LX9oiEoCh4lMloHFW2HQK9zQ7+5grg2rOCjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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