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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0279694b000e0684dc4e9b92c6d664ee8574f4b3609935a8f325c9ea1eba26d7' 
  AND token = '3V3m2gYJSc+m1zDrzco8L/Gaa3ujrRYT5zW3flUSaDc=' 
  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"
    }
  }
}