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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d9e28165de6a680cd2dafbf0963e40e67ce48bb062f19a9468461bb6081336' 
  AND token = 'vG12lJ+rP6Upmo8sZjU533FHYVSZboYwxrRTxjgExJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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