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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4659a14f35a5d28c3d0ffaf4f0cb6a43299f0a26c1db1e737aa45c0fb50943' 
  AND token = '6A0Z3TR/gSH9H4EBipI6GOOSsIz74m6CyNP6RZEZrvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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